"NonFermi liquid fixed point for an imbalanced gas of fermions in 1+ ε dimensions"Andrew James , University of Virginia [Host: Austen Lamacraft]
ABSTRACT:
We consider a two species gas of fermions with population imbalance.
Using the renormalisation group in d=1+ ε dimensions, we show that for spinless fermions and ε > 0 a fixed point appears at finite attractive coupling where the quasiparticle residue Ζ vanishes, and identify this fixed point with the transition to LarkinOvchinnikovFuldeFerrell order (inhomogeneous superconductivity). When the two species of fermions also carry spin degrees of freedom we find a repulsive fixed point, indicating a transition to spin density wave order.

Condensed Matter Seminar Monday, November 23, 2009 3:30 PM Physics Building, Room 204 Note special date. Note special room. 
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